Apparatus for distributing fuel in internal-combustion engines.



H. T. BRUN S.

APPARKTUS FOR DISTRIBUTING .FUEL IN INTERNAL COMBUSTION ENGINES.

APPLIOATION FILED 11111.24, 1911.

1,026,732. Patented May 21, 1912.

[dz/[IIIII/IIIIIIIIIIIIIIK UNITED STATES PATENT OFFICE.

HANS TH. BRUNS, OF NUREMBERG, GERMANY.

APPARATUS FOR DISTRIBUTING FUEL IN INTERNAIPCOMBUSTION ENGINES; I I

peciflcat1on of Letters Patent.

To'all whom it may concern.

Be it known that I',HANs TH. BRUNS, a subject of the King of Prussia,residing at Nuremberg, in the Kingdom of Bavaria and German Empire, haveinvented an Improved Apparatus for Distributing Fuel inInternal-Combustion Engines, of which the following is a specif cation.

This invention relates to an improved apparatus for'distributing fuel ininternal combustion engines.

In internal combustion engines the fuel, such as benzin, petroleum, orheavy oils, is supplied to the spraying jets or nozzles at regularintervals of time, either by automatic flow under an unvaryin head ofpressure, by means of constant a r pressure, or by means of a specialpump. The present invention is only directed to engines of the latterclass, in which the fuel is supplied to the cylinders by means ofspecial oil pumps. In the known machines of this kind the fuel is drawnby the oil pumps from a reservoir communicating with the atmosphere andforced to the atomizer in suitable quantities. This method ofdistributing the oil is, however irregular and this defect cannot bewholly obviated by the provision of correcting means,such as present dayexperience has demonstrated that this method is 'not applicable at allto marine engines.

According to my present invention, the engine is provided with a. searate'closed intermediatechamber into w ich the fuel is forced by aspecial pum of'large capacity so that in the said cham er it will beunder a given pressure. The fuel is sucked from the saidchamber througha valve by means of a second pump and forced throu h a second valve anda supply conduit mto the combustion chamber or cylinder-of the motor. Itis essential that the oil should always completely fill the workchambers of the distributing pumps as the oil in the intermediatechamber is subjected to excess pressure. This arrangement is alsoadvantageous in that the main pump can be utilized for filling thesupply conduits, etc., before the engine is started. In order toregulate the pressure conditions in the oil chambers and for the purposeof emptying them, if necessary, a discharge pipe with loaded or springcontrolled valve is provided on the intermediate chamber; this dischargepipe can be connected to the tank fibats or, the like, and

so that the oil flowing oflf returns into the storage tank or reservoir.l

The invention is illustrated diagrammatically by way of example in theaccompanying drawing.

a indicates the The pump b forces the oil out of the reservoir into thesaid chamber a, the upper part of which may contain air, which will actas a cushion. The chamber a is connected with the work chamber of thedistributing pump d through a pipe (2. A valve is arranged at e in thesuction pipe. The'piston of the pump d is marked 7, and the deliveryvalve 9. The pressure strokes of the pump 7 force the oil drawn into thework chamber at of the pump through the valve 9 and the supply conduitit into the spraying nozzle of the combustion chamber not shown. Thedistributing gear necessary to produce this result is 0 any knownconstruction. The regulating valve on the discharge pipe 6 of theintermediate chamber is illustrated by j. My new apparatusoperates asfollows The pump 1) forces the fuel into the intermediate chamber a toan amount in excess of what the ump d can 'deliver to theengine. Thereore, the fuel in the' chamber a will be under a certain 'ressure, whichis determined by the loaded valve j. If the pressure in the chamber aexceeds the load ofthe valve 7', fuel will flow from the chamber athrough the pipe i back to the supply tank, from which the pump 6 pumpsthe fuel into the chamber a. Since only an excess pressure in chamber ais taken care of by the valve 9', there will bein chamber 0: always aconstant pressure, which will aid the suction stroke of the piston f ofthe delivery pump 01 so .as to completely fill the cylinder of saidpump, even when a heavy oil is used as a fuel and when the engine runsat a higher speed. In ordinary fuel supply pumps, where a heavy oil isused, and the pump runs at a hi her speed, thecylinder will not becomplete y filled at each suction stroke of the pump piston and the ewill be, therefore, a certain vacuum in the pump cylinder. This isentirely obviated by the fuel supply apparatus according to myinvention.

Having described my invention what I claim is 1. In an apparatus fordistributing fuel in internal combustion engines, .the combination witha fuel supply tank of an interintermediate chamber.

PatentedMay21,191 2.

constantly maintain a pressure in said chambar, a .conduit entering saidchamber, and a second pump connected to sa1d condu1t for delivering fuelfrom the chamber to the engme.

3. In an apparatus for distributing fuel in internal combustion enginesthe combination with a fuel supply tank of an intermediate closedair-containing chamber, a pump for forcing the fuel from said supplytank into said chamber to an amount sufficient to constantly maintain apressure in said chamber, a conduit entering said chamber, and a secondpump connected to said conduit for deliverin fuel from the chamber tothe engine, an a valve in said conduit intermediate the chamber and saidsecond pump.

4. In an apparatus for. distributing fuel in internal combustionengines, the combination with a fuel supply tank of an intermediateclosed air-containingi chamber, a pump for forcing fuel from sai sup lytank into said chamber to an amount su c1ent to constantly maintain apressure in said chamber, a second pump connected to said chamber andadapted to deliver fuel therefrom to the engine,.a discharge i econnected to said chamber and a loa e valve in said discharge pipe,adapted to automatically control the pressure in said'chamber.

5. In an apparatus for. distributing fuel in internal combustion enginesthe combination with a fuel supply tank of an intermediate closedair-containing chamber, a pump for forcing the fuel from said suply tankinto said chamber to an amount su c1ent to constantly maintain apressure in said chamber, a conduit entering said 'chamber, and a secondpump connected to; said conduit for deliverin fuel from the chamber tothe engine,an a valve in said conduit intermediate the chamber and saidsecond pump, and a discharge pipe connected to said chamber, and aloaded valve in said discharge pipe adapted to automatically control thepressure 1n said chamber.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HANS TH. BRUNS.

Witnesses:

RALPH W. Dox, ELISABETH HELLMUTH.

